Projectile.



R. NAGLO.

APPLICATION PIL 111111111111 a.

91 1,430. Patented Feb. 2, 1909.

ROBERT NAGLO, OF WIESBADEN, GERMANY.

PROJEU'I'ILE.

Specification of Letters Patent.

Patented Feb. 2, 1909.

Application filed May 18, 1908. Serial No. 488,620.

To all whom it may concern:

Be it known that I, ROBERT NAGLO, mayor, a subject of the King of Prussia, and residing at No. 7 2 KaiserFriedrichring, Wiesbaden, Germany, have invented certain new and useful Improvements in Projectiles, of which the following is a specification.

The present invent-ion relates to so called double-ogival projectiles. Its new feature consists in the front-point gradually thickening itself to the biggest sectional area from which area it tapers without intercalation of a long cylindrical uide-part, so that the tail-point beginning from the said bi gest sectional area or from the end of t e short guide-partconstitutes at least one half of the totallength. In this way the center of gravity by the very form of the projectile moves relatively far to its head whereby a long tail steering point is obtained, which centers the projectile in the barrel, so that it may be fired off withoutT-bottom guide and gives the projectile the necessary stability in flight.

The new projectile may be made wholly out of hardened steel and is coated on its biggest sectional area with copper or the like or be provided for the urpose of easier production on its whole ore-part with a copper-cap; The purpose of this is to provide the projectile with an envelop of softer material than the steel body, so that said envelop may be pressed into the groove of the rifle barrel to give the projectile the necessary guidance.

Figure 1 is an elevation of the pro'ectile; and Fig. 2- a longitudinal sectiona view thereof.

For the purpose of illustrating the invention the new projectile is schematically resented in the accompanying drawing. fore-point or head a turns into a thickened portion 12, which contains the largest sectional area and has to care for tightening the projectile in the barrel or grooves. Thus the projectile gradually and centrally glides into the grooves whereby the depth of the grooves is filled up with the smallest amount of friction inia lnable. From the largest sectional area t e projectile tapers backwards to the point p which bein outwardly closed all around ermitsthe air when the projectile is in flig t to glide alon the walls without resistance and prevents t 1e (projectile from forming a vacuum behin itself. Thispeculiar' shape of the rear-portion or section at all tail of the projectile which may a steering point in connection with the fact that the center of gravity moves beyond the ,middle of the length to about the line tie-m helps on the one hand to center the rojectile in the barrel and on the other iand to be termed V steer it durin flight, so that even projectiles being more tia'n four fold the caliber may be used without increasing the twist. The pointed head and tail of the projectiles may be curved either convexly or concavely upon different angles of the points. As shown in the drawings the pro ectile is convex in contour from end to end and forms a line of continuouslychanging curvature. The copper-cap may be iven in front under certain circumstances a arger thickness as indicated in Fig. 2 so that the center of gravity owing to the difference between the s JEClfiC weights of the metals moves towards t e fore-part of the projectile whereby the tail point conseuently may be proportioned a little shorter t ian before.

Claimsr 1. A projectile formed circular in crossoints throughout its length and provided wit a forward y tapering pointed cad, said head terminating at the point'of reatest cross-sectional area and the remainder of the projectile tapering from said point of greatest cross-sectional area to its rear end on a line of continuously changing curvature, the rear end of the projectile bein pointed, the point of greatest cross-sectiona area bein forward of the middle of the rojectile, w ereby the center of gravity wi be forward of the middle and the tapering rear part of the projectile will be greater in length than the ta ering forward part thereof.

2. A dou le ogival projectile formed with a front portion gradually thickening to the greatest cross-sectional area from which point it tapers rearwardly without intercalar tion to form a long guide part, the projectile being circular in cross-section at all points throughout its length, the point of greatest cross-sectional area being forward of the middle thereof, whereby the center of gravity of the projectile Will be forward of its middle.

3. A projectile pointed at both ends and circular in cross-section at all "bints throughout its length and formed with a gradually enlarging portion which extends to the point of greatest cross-sectional area, the rear portion tapering from said point of. greatest cross-sectional area to the rear end of a'line of continuously changing curvature, the contour of the projectile being convex from end to end and the point of greatest cross-sectional area being forward of its middle.

4. A projectile formed circular in crosssection at all points throughout its length and provided with a forwardly tapering pointed head, said head terminating at the point of greatest crosssectional area and the remainder of the projectile tapering from said point of greatest cross-sect1onal area to its rear end on a line of continuously chan in curvature, the rear end of the projecti e being pointed, the oint of reatest crosssectional ar a being forward 0 the middle of the proj ecti e, whereby the center of gravity will be forward of the middle and the tapering rear part of theprojectile will be greater in len th than the tapering forward part thereo and a soft metal ca coverin the forward portion of the pro ecti1e an extending over the part of greatest cross-sectional area.

5. A double ogival projectile formed with a front portion gradually thickening to the eatest cross-sectional area from which point 1t tapers rearwardly without intercalation to form a long guide part, the projectile being circular in cross-section at all 'oiuts throughout its length, and a soft meta coat ing covering the portion of greatest crosssectional area.

6. A. projectile pointed at both ends and circular in cross-section at all points throughout its len th and formed with a gradually enlargin lie-ad portion which extends to the point 0 greatest cross-sectional area, the rear portion tapering from said point of greatest cross-sectional area to the rear end on a line of continuously changin curvature, the contour of the projectile being convex from end to end and the point of greatest cross-sectional arembeing forward of its" middle, and a soft metal cap covering the forward, portion of the projectile and extending over the portion of greatest crosssectional area, said cap extending forward of the front end of the rojectile.

In testimony whereol I have signed my name to this specification in the presence of two subscribing witnesses:

ROBERT NAGLO.

Witnesses:

WOLDEMAR HAUIT, HENRY HASPER. 

